Nonuniversal dynamic conductance fluctuations in disordered systems
Abstract
Sample-to-sample fluctuations of the time-dependent conductance of a system with static disorder have been studied by means of diagrammatic theory and microwave pulsed transmission measurements. The fluctuations of time-dependent conductance are not universal, i.e., depend on sample parameters, in contrast to the universal conductance fluctuations in the steady-state regime. The variance of normalized conductance, determined by the infinite-range intensity correlation C3(t), is found to increase as a third power of delay time from an exciting pulse, t. C3(t) grows larger than the long-range intensity correlation C2(t) after a time tq ~ <g>1/2 tD (tD being the diffusion time, <g> being the average dimensionless conductance).
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